778494494863 has 2 divisors, whose sum is σ = 778494494864. Its totient is φ = 778494494862.

The previous prime is 778494494857. The next prime is 778494494881. The reversal of 778494494863 is 368494494877.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 778494494863 - 2²⁵ = 778460940431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778494494803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389247247431 + 389247247432.

It is an arithmetic number, because the mean of its divisors is an integer number (389247247432).

Almost surely, 2^778494494863 is an apocalyptic number.

778494494863 is a deficient number, since it is larger than the sum of its proper divisors (1).

778494494863 is an equidigital number, since it uses as much as digits as its factorization.

778494494863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1170505728, while the sum is 73.

The spelling of 778494494863 in words is "seven hundred seventy-eight billion, four hundred ninety-four million, four hundred ninety-four thousand, eight hundred sixty-three".